CN1266680C - Optical disk device - Google Patents

Abstract

An optical disk drive for optimizing laser power to be used at the time of recording operation. In a DVD-R drive and a DVD-RW drive, a controller performs OPC to set recording power and records RMD serving as recording management data in an RMA serving as a recording management area. The RMD are verified. When the RMD can be read, the number of PI errors in the RMD is detected. If the number of PI errors is equal to or less than an allowable value, data are recorded in a data area at that recording power. If the number of PI errors exceeds the allowable value, OPC is again performed, to thereby reset the recording power.

Description

CD device

technical field

The present invention relates to an optical disc device, and more specifically, to a data-recordable optical disc device in which recording power is optimized.

Background technique

It is known that in drive devices such as read-only/read-write optical disc devices (CD-R/RW drive), read-only/read-write digital disc devices (DVD-R/RW drive), etc. A technique for optimizing recording power. When recording data, test data is recorded in a test area (PCA area: power correction area) of an optical disc, and recording power is optimized based on the reproduced signal quality of the test data. This technology is generally called Optimum Power Control (OPC: Optimum Power Control), and uses Optimum Power Control to record data in the data area of the optical disc with optimal power.

FIG. 6 shows an example of a flow of data recording processing in a DVD-RW drive device. First, DVD-RW is loaded on the drive device, and the controller in the device executes OPC (S101). Specifically, for example, test data is sequentially recorded in the PCA area at a rate of change of laser power of 0.5 mW, and the test data is reproduced to evaluate the quality of reproduced signals obtained for each laser power. Reproduced signal quality can be evaluated by β value, modulation degree m, γ value, jitter, etc. For example, when the β value is used as the evaluation parameter of the reproduced signal quality, the β value of the reproduced signal quality is compared with the predetermined target β value, and the laser power closest to the predetermined target β value is extracted. After the OPC is executed, the extracted laser power is set as the recording power (S102).

After setting the recording power, record (S103) management data RMD (Recording Management Data) on the recording management area RMA (Recording Management Area) of the DVD-RW. After the management data RMD is recorded, it is verified whether the RMD has been definitely recorded (verification: S104). When the verification step is performed, since the DVD-RW cannot be activated when the RMD cannot be read, or even if it is activated, the management data does not exist and it is unknown where to record it, so that correct data recording cannot be performed. When the result of the verification is that the RMD cannot be read out, the RMD is recorded again, or the OPC step is performed again to optimize the recording power, and then the RMD is recorded again for verification. On the other hand, when the verification result is positive, that is, when the RMD can be read, data is recorded in the data area at the recording power set in S102 (S105).

Fig. 7 shows the data format of DVD-RW. In DVD-RW, there are PCA area (power correction area, Power Calibration Area), RMA area (recording management area, Recording Management Area), read-in area (read-in area), data area (dataarea), in the RMA area Record RMA read data and RMD (Record Management Data). The data read by the RMA includes device manufacturer ID, serial number, disc identification number and the like. In addition, the RMD includes OPC-related information, data area information, recording mode information, and the like. RMD consists of 28 groups from group 1 to group 28. Each group consists of 5 blocks. Each block includes a link loss area and addresses 0-14. The size of each block is 32 KB, and different information is recorded in address 0 to address 14 according to the DVD-RW mode (increment mode, decrement mode, rewrite mode). For example, in incremental mode (additional mode can be used to add records sequentially. When data recording is completed, record the information on RMA), record common information at address 0, record OPC information or pointer information of RMD group at address 1, etc., at Address 2 records user-designated data and delete action information. The deletion action information refers to information indicating the deletion position and the number of times of deletion.

In this way, after verifying the management data RMD, after the RMD can be read, the data is supplied from the host device to the data area for recording. The state of the recorded data on the data area. This is because, in the verification process of the RMD, it is simply determined whether the RMD can be read, and the recording quality of the data is not quantitatively evaluated, so the recording quality of the data recorded in the data area cannot be ensured. In particular, among the various optical discs circulating on the market, the characteristics of the recording film are uneven, and the recording power is not necessarily the optimal value. Therefore, the data recorded by a certain drive device cannot be reproduced by another drive device. There are many situations.

Here, there are known proposals to optimize the recording power obtained by OPC to ensure the recording quality. For example, in a CD-RW drive, data is recorded in the data area based on the recording power obtained by OPC, and the data is reproduced to detect errors. When the error exceeds the allowable value, OPC is executed again to optimize the recording power, and the recorded data is rewritten in the data area with the obtained recording power. Alternatively, when OPC is performed on the test area, not only the quality of the reproduced signal of the test data but also the error is detected, and when the error is below the allowable value, this laser power is set as the recording laser power.

Patent Document 1: Japanese Patent Laid-Open No. 11-454405

Patent Document 2: Japanese Patent Laid-Open No. 2002-260230

Contents of the invention

However, in the configuration in which data is recorded in the data area, an error in the data is detected, and OPC is executed again, there is a problem that the data area is consumed due to trial writing of data in the data area. Furthermore, the trial data in the data area must be rewritten, so it is limited to CD-RW discs and the like, and there is a problem that it cannot be applied to discs that cannot be rewritten. In addition, in the structure of recording test data in the test area (PCA area) to detect its errors, in order to detect errors, it is also necessary to record enough test data (at least 1ECC block = 16 sector test data, multiple laser power must have such test data), so there is a problem of consuming the test area. Furthermore, OPC itself has a waiting time for users not to record data, and increases the time for recording data, which is not ideal for convenience.

An object of the present invention is to provide an optical disc device which can optimize recording power during recording without consuming a test area and a data area of the optical disc.

The present invention is a data-recordable optical disc device, comprising: a setting mechanism for recording test data in a test area of the optical disc, and setting recording power according to the quality of the reproduced signal obtained by reproducing the test data; recording management data in the recording management area of the above-mentioned optical disk; the verification mechanism verifies the above-mentioned recorded management data; the error detection mechanism detects the number of errors in the management data when the above-mentioned verification result is positive; the comparison mechanism compares the above-mentioned number of errors with Comparing the allowable value; the correction mechanism corrects the recording power when the number of errors exceeds the allowable value. Even when the result of verifying the management data is affirmative, that is, when the management data can be read out, the data is not recorded at the recording power, and errors in the management data are quantitatively evaluated. Therefore, when the number of errors in the management data exceeds the allowable value, even if the data is recorded at the recording power, the data cannot be recorded with high quality. In order to avoid the possibility that the recorded data cannot be reproduced by other devices, for example, the recording power is corrected and reset. . The present invention utilizes the processing necessary for data recording, that is, manages data recording processing, evaluates recording quality, and efficiently performs resetting processing of recording power.

In one embodiment of the present invention, the correction means corrects the recording power by repeatedly performing a method of changing the setting by the setting means. The reason for changing the setting method is that if the processing algorithm is the same as the processing algorithm when OPC was first executed, the recording power cannot be effectively corrected, and the PCA area may be wasted unnecessarily. In addition, the method of changing the setting may be changed according to the magnitude of the number of errors in the management data.

According to the above-mentioned correction means, the method of changing the setting method is arbitrary, for example, the amount or ratio of increasing or decreasing the recording power can be designated and corrected. It is also possible to reduce the variation range of the laser power, and to correct it by repeating execution by the setting mechanism. Alternatively, the target value may be changed, and the setting mechanism may repeatedly execute and correct it. It is also possible to modify the recording strategy itself without modifying the laser power or the target value (or while modifying). It is also possible to set the recording power initially obtained by the organization as a benchmark, and then search around it for correction.

The present invention also provides an optical disc device, comprising: a counting mechanism, which calculates the number of errors by reproducing the uneven data of the optical disc; a tolerance setting mechanism, which sets the allowable value according to the error number of the uneven data; The recording power mechanism changes the laser power to record the test data on the optical disc, and sets the recording power according to the reproduced signal quality of the test data; the management data recording mechanism uses the recording power to record the management data recorded on the optical disc; an error counting mechanism that calculates the number of errors by reproducing the management data; a data recording mechanism that changes the recording power around the recording power when the number of errors in the management data exceeds the allowable value The laser power is used to record the test data again, and the recording power is set again according to the reproduced signal quality of the test data, and when the error number of the management data is below the allowable value, the data is recorded on the on the disc.

Description of drawings

FIG. 1 is a block diagram showing the configuration of the embodiment.

FIG. 2 is a processing flowchart of the embodiment.

FIG. 3 is a detailed flowchart of the OPC execution process of FIG. 2 .

FIG. 4 is a diagram illustrating an OPC execution process using dithering.

FIG. 5 is an explanatory diagram when OPC is re-executed.

Fig. 6 is a processing flowchart of a conventional device.

Fig. 7 is an explanatory diagram of the RMA format in DVD-RW.

Symbol Description:

10: Optical disc; 12: Optical pickup (PU); 14: Servo detection unit; 16: Tracking control unit; 18: Focus control unit; 20: RF detection unit; 22: Signal processing unit 26: Decoder; 30: Controller; 32: laser diode drive circuit (LDD)

Detailed ways

Hereinafter, embodiments of the present invention will be described by taking a DVD-R drive device as an example with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an optical disc device according to this embodiment. The optical pickup (PU) 12 faces the optical disc 10 (DVD-R), and has a structure including a laser diode (LD) and a photodetector that emit laser light onto the surface of the optical disc 10 . The laser diode is driven by a laser diode drive circuit 32 (LDD), and emits laser light at a reproducing power when reproducing data, and emits laser light at a recording power when recording. The photodetector of optical pick-up 12 is identical with the known structure that uses differential push-pull method (Differential push-pull method), is respectively provided with the photodetector that is used for main light beam and two bundles of sub-beams, according to the amount of reflected light to the servo detection part 14 and the RF detection unit 20 output detection signals.

The servo detection unit 14 generates a tracking error signal TE and a focus error signal FE according to the signal from the optical pickup 12 , and outputs them to the tracking control unit 16 and the focus control unit 18 respectively. The tracking error signal TE is generated by the differential push-pull method, specifically, it is generated by the difference between the push-pull signal of the main beam and the push-pull signal of the sub-beam. The focus error signal FE is generated by the astigmatic method (Astigmaticmethod).

The tracking control unit 16 drives the optical pickup 12 along the width direction of the track of the optical disc 10 according to the tracking error signal TE to maintain an on-track state. The focus control unit 18 drives the optical pickup 12 in the focus direction according to the focus error signal FE to maintain the focus state.

The RF detection unit 20 amplifies the signal from the optical pickup 12 , specifically the sum signal from the photodetector that receives the reflected light of the main beam, generates a reproduced RF signal, and outputs it to the signal processing unit 22 and the decoder 26 . When the signal processing unit 22 executes OPC (Optimum Power Control), it measures the β value or the degree of modulation m from the reproduced signal, and outputs it to the controller 30.

The controller 30 is used to control the laser diode drive circuit (LDD) 32 and the RF detection unit 20 to execute OPC, and determine the optimal recording power from the β value or modulation degree m calculated by the signal processing unit 22, or according to the jitter of the decoder 26 , control the LDD32 at the optimal recording power. The test data when OPC is executed is supplied from the controller 30, and random data of, for example, 3T to 14T is used as the test data.

In addition, the controller 30 is used to verify the RMD (Recording Management Data) recorded in the RMA (Recording Management Area) area on the optical disc 10, and decide whether to execute the OPC again according to the verification result. In addition, when the verification of the RMD is affirmative, the controller 30 does not directly record data in the data area of the optical disc 10 as in the prior art, but detects the number of errors in the RMD, compares the number of errors with the allowable value, and if the number of errors in the RMD is When the number of errors is less than the allowable value, it is determined that the recording quality is maintained, and data is recorded in the data area of the optical disc 10 . The data to be recorded is sent to the controller 30 by a host device such as a personal computer, and is sent to the LDD32 after being encoded by an encoder not shown in the figure. The error count of the RMD is obtained by calculating the data from the decoder 26 by the error correction circuit in the controller 30 . The error correction circuit may be provided at the rear stage of another decoder 26 other than the controller 30 . The set allowable value can be stored in the memory of the controller 30 in advance, or can be properly set according to the optical disc 10 . A method of setting an appropriate allowable value will be described in detail later.

The decoder 26 has an equalizer, a binary converter, etc., to gain and reproduce the specified frequency of the RF signal, specifically the amplitude of the gain 3T signal, and then perform binary conversion, demodulate the binary signal, and output it to the controller 30 . After demodulation, a synchronous clock pulse signal is generated by a PLL circuit not shown, and signal extraction is performed. Furthermore, the decoder 26 adds the phase difference between the binary signal and the synchronous clock pulse, detects jitter, and sends it to the controller 30 . The decoder 26 outputs binary signals and synchronous clock pulses. The decoder 26 can also detect jitter by different jitter detection circuits, and then the controller 30 detects it. The controller 30 outputs the demodulated data from the decoder 26 to a higher-level device.

FIG. 2 shows a flowchart of data recording processing in this embodiment. First, information on the loaded optical disc is acquired (S201). The information on the optical disc refers to the type and manufacturer of the optical disc, or the target value at the time of OPC execution, and the like. The target value when OPC is executed can be pre-stored for each manufacturer in the internal memory of the drive device, and after obtaining the manufacturer's data, the target value corresponding to the manufacturer can be read out from the memory.

After obtaining the disc information, OPC is then executed (S202). During OPC, as in the prior art, the controller 30 makes the laser power change in multiple stages, for example, changes in the range of 5.0mW to 12mW at a rate of change of 0.5mW, and records the test data in the PCA area of the optical disc 10, and then The test data is reproduced, and the quality of the reproduced signal for each laser power is evaluated. The reproduced signal quality can be evaluated using β value, modulation degree m, γ value, jitter, etc. In this embodiment, as described above, the reproduced signal quality of test data is evaluated using jitter.

Next, the OPC processing will be described.

FIG. 3 shows a flowchart of the OPC processing in S202. The laser power changes at a rate of 0.5mW, and the test data is recorded in the PCA (Power Calibration Area) area (S2021). The test data is random data from 3T to 14T. After recording the test data, the test data is reproduced to detect jitter for each laser power (S2022). Jitter is the sum of the phase differences between the demodulated test data and the synchronous clock signal. After the jitter for each laser power is detected, the minimum value Jmin is extracted from the obtained multiple jitters (S2023), and the jitter J=K· Laser power P1, P2 of Jmin (S2024). From this, the intermediate power P ₀ =(P1+P2)/2 of the laser powers P1 and P2 to obtain the jitter J is calculated (S2025).

FIG. 4 is a schematic diagram of OPC processing using the dithering described above. In the figure, the horizontal axis represents laser power (mW), and the vertical axis represents jitter. Generally speaking, the jitter will increase due to insufficient or excessive laser power, so it is drawn as a downward convex curve. However, the jitter curve is not necessarily steep, and it is not easy to extract a single minimum jitter laser power. Therefore, the minimum value Jmin of the jitter is extracted within the range obtained by the multi-stage discrete laser power, and the laser power P1 and P2 obtained by multiplying the minimum value Jmin and the coefficient K to obtain the jitter J=K Jmin are obtained, and the jitter curve is relative to On the premise that the laser power is roughly symmetrical, the intermediate value P ₀ is calculated, so that the laser power P ₀ with the minimum jitter with high precision among the limited number of laser power segments can be extracted.

Returning to FIG. 2 , after performing the above-mentioned OPC process to extract the laser power P ₀ , the controller 30 sets the laser power P ₀ as the recording power ( S203 ). After setting the recording power, the controller 30 records RMD of 1 block, that is, management data, in the RMA area of the DVD-R (S204). The recorded 1RMD block is then verified (S205). When the RMD is read, the verification result is OK, and it moves to the next process (S206). On the other hand, when the RMD cannot be read, the determination is NG (negative), OPC is executed again, and the recording power is set again (S202).

In the prior art, when the verification result of the RMD is OK, it moves to the data area of the optical disc 10 for data recording processing, but in this embodiment, the controller 30 also moves to the processing of detecting an RMD error, specifically It is a process for detecting a PI error (S207). The so-called PI error is an internal coding parity error of 1ECC block. There are 172 bytes (byte) and 192 columns of information addresses in 1ECC block. The 192 columns of information addresses plus 16 columns of external parity codes give a total of 208 columns corresponding to 10 bytes of internal parity codes PI. In the process of S207, the internal parity code PI assigned to each of the 208 columns is checked, and the number of errors thereof is calculated. The maximum number of errors is 208. After detecting the number of PI errors in the RMD, it is determined whether the number of errors is below the allowable value (S208). The allowable value can be preset as a fixed value such as 35. Also, as described above, the allowable value can be changed dynamically according to the optical disc 10 . Specifically, the unevenness data formed in the control data area of the optical disc 10 is reproduced, and the allowable value is set according to the number of errors. The reproduction of unevenness data is carried out under optimum conditions regardless of the recording conditions, and the reproduction performance can be evaluated with high accuracy in the combination of the optical disc 10 and the drive device. The number of PI errors of the uneven data formed in the control data area is detected, and the allowable value is obtained by multiplying the number of PI errors per 1 ECC block by a specified coefficient C (C>1). When the number of PI errors of the uneven data is high, it is considered that the reproduction performance of the combination of the optical disc 10 and the drive device is poor. In this case, by setting a higher allowable value, the recording quality can be properly evaluated. The dynamic setting of the allowable value can be performed, for example, before recording the RMD in the RMA.

As a result of comparing the PI error number of RMD with the allowable value, if _it is below the allowable value, then it is judged that there is no problem of data recording, and it can be executed. , readout unit) records data (S209). On the other hand, when S208 determines that the number of PI errors exceeds the allowable value, the recording power _P0 set by S203 is not necessarily the optimal power, that is, although it is the level that the RMD itself can be read, it cannot be read with a sufficiently low error. If the recording rate is low, or the recording margin is small, it is determined that it is difficult to record data with high quality in the entire data area of the optical disc 10, and the controller 30 executes OPC again after changing the OPC strategy (S210). RMD recording, verification processing, and RMD PI error number evaluation processing are performed again on the recording power obtained by re-executing OPC, and when the number of PI errors is below the allowable value, data is recorded at the recording power (S209).

There are many ways to process the OPC policy change in S210.

Laser power variation reduction processing

When in the first OPC, the laser power changes at a rate of change of, for example, 0.5mW, in the second OPC, with a change range smaller than that of the first time, for example, a laser power change range of 0.2mW, record Test Data. Although the test data can be recorded between 5.0mW and 12mW with a change range of 0.2mW in the same way as the first time, it is preferable to perform OPC with a change of only 0.2mW around the recording power P ₀ obtained in the first OPC. Therefore, the consumption of the PCA area can be suppressed, and the OPC time can be shortened.

Figure 5 is a schematic diagram of this process. Taking the recording power P ₀ obtained from the first OPC as the center, the test data was recorded with the laser power varying only -0.2mW, -0.4mW and +0.2mW, +0.4mW. For the test data recorded at five levels of laser power (including P ₀ ), the reproduced signal quality is evaluated by jitter, and the recording power is reset by the same process as S2023-S2025. Since the optimal recording power can be considered to exist near the recording power P ₀ obtained from the first OPC, by limiting the recording power near the recording power P ₀ and searching for the optimal recording power with a small range of variation, it is possible to regenerate in a short time. Set the optimal recording power.

Change processing of target value

In the second OPC, the target value of the reproduced signal quality used in the first OPC is changed. For example, when evaluating the reproduced signal quality of the test data using the β value, the target β value is increased or decreased by a predetermined amount or a predetermined ratio with respect to the first target β value. Whether to increase or decrease the target value is judged, for example, for an optical disc that is prone to thermal deformation and bending, it is preferred to decrease the target value, and for an optical disc that is difficult to record, it is preferred to increase the target value. The β value is defined as β value=(|A1|−|A2|)/(|A1|+|A2|). A1 is the peak value of the RF signal combined with AC, and A2 is the lowest value. In general, the greater the laser power, the greater the β value. In the determination process of S208, when it is determined that the number of PI errors exceeds the allowable value, it is difficult to record on the optical disc (whether it is difficult to record is determined by the optical disc manufacturer, for example), and it can be considered that the recording power P ₀ ratio set by S203 is optimal. If the power is small, it can be corrected by increasing the value of β, and the recording power can be reset to be higher than the recording power set in S203. In the second OPC, as described above, it is preferable to set a laser power to obtain a new target value for a plurality of laser powers near the recording power P ₀ . The change of the target value is not related to the OPC based on jitter, but is effective for the reproduced signal evaluation parameter of OPC with the β value or the modulation degree γ value.

Process of increasing or decreasing laser power by specified amount or specified ratio

Instead of performing OPC again, when S208 determines that the number of PI errors exceeds the allowable value, the recording power _P0 set in S203 is increased or decreased by a specified amount (such as 0.3mW) or a specified ratio (such as 10%), and the obtained The recording power was taken as the optimal recording power. After the recording power is set again in S210, the process moves to S204, where the management data RMD is recorded in the RMA, and after the management data RMD is verified, the number of PI errors in the RMD is detected and compared with the allowable value. When evaluating OPC based on jitter to determine the optimal recording power, the RMD can also be reproduced to measure the β value and judge its size, thereby deciding whether to increase or decrease the laser power. It is also possible to repeatedly increase or decrease the laser power according to the change of the number of errors.

For DVD-RW discs, by increasing the laser power, the number of PI errors can be reduced in most cases. On the other hand, for DVD-R discs, when the laser power is too high, thermal deformation and bending will occur, which may increase the number of PI errors instead. Therefore, for DVD-R discs, when the number of PI errors exceeds the allowable value, the reproducible management data RMD can detect its β value, and decide to increase or decrease the laser power according to the β value.

In addition, it is also possible to reduce the rotational speed of the optical disk and then execute OPC, or to adjust the target modulation degree m, the target γ value, etc. instead of adjusting the β value and then execute OPC. In addition, it is also possible to re-execute OPC by changing the recording strategy (regulation of the emission waveform of the recording pulse). The recording strategy can be set by a plurality of graphic strategy information pre-stored in the memory of the drive device. At the time of the first OPC, the recording strategy of the first pattern is used, and at the time of the second OPC, the recording strategy of the second pattern is used by increasing or decreasing the pulse width of the recording strategy of the first pattern. When recording data with multiple pulses, the recording strategy can be changed by changing the width and intensity of the previous pulse, the width and pulse interval of the subsequent pulse.

Like this, in this embodiment, even when the verification of RMD is affirmative, still calculate the PI error number of RMD, only when the error number is below the allowable value, just record data with the recording power set by OPC, therefore can be recorded on the optical disc 10 High-quality data can be recorded on the optical disc 10, and data can be reliably read out when the optical disc 10 is reproduced by other devices. Furthermore, in this embodiment, the RMD recording process necessary for recording data eliminates the need to record new test data and calculate the number of errors in order to evaluate the recording quality. In addition, in order to calculate the number of errors, it is necessary to record data of at least 1ECC block size, but in DVD-R drives, RMD is recorded in block units, so the above conditions are satisfied.

In this embodiment, an optical disc device has been described taking a DVD-R drive device as an example, but the same applies to a DVD-RW drive device. When using a DVD-R disc, as described above, the RMD of the management data is recorded in the RMA block by block, while for a DVD-RW disc, the RMD of 5 blocks is first collected and recorded in the RMA, and then, Then record block by block. First, five blocks are collected and RMD is recorded, which is erasure information for recording data in the first five blocks in the DVD-RW drive. After the first 5 blocks, recording is performed block by block similarly to DVD-R discs, therefore, it is preferable to detect the number of PI errors in this 1 block portion and compare it with the allowable value. Of course, it is also possible to not only detect the number of PI errors in 1 ECC block, but detect the number of PI errors in, for example, 5 or 8 blocks, and compare it with the allowable value. When evaluation is performed using the number of PI errors detected in 8 blocks, the allowable value is preferably 8 times the allowable value of 1 block. From the viewpoint of rapid processing, it is preferable to compare the number of PI errors in one block with an allowable value.

In addition, the present invention can also be applied to a CD-R drive or a CD-RW drive. In the DVD-R drive or DVD-RW drive, the management data RMD is recorded in the RMA, and then the data is recorded in the data area. Therefore, by detecting the number of PI errors in the RMD, it is unnecessary to Wrong use test data to try to write in other test area or data area, because RMA and RMD do not exist in CD-R disc or CD-RW disc, can't use this kind of processing directly. On the other hand, a CD-R disc or a CD-RW disc has a count area adjacent to the PCA area, and in this count area, the number of recording times of test data to which the PCA area is used is managed. Therefore, the same processing can be performed using the management data recorded in the count area. Specifically, the number of PI errors in the management data recorded in the count area is detected, compared with the allowable value, and when the allowable value is exceeded, the OPC policy is changed and OPC is executed again. In this case, the number of errors is counted and the error evaluation is performed by using the process of writing data into the count area which is inherently necessary, thereby saving unnecessary processes and ensuring recording quality. Also, in DVD+R and DVD+RW, the same process can be performed using the TOC area equivalent to the RMA. Also, in the TOC area of DVD+R/RW, 16 sectors=1ECC block are recorded in one recording.

In this embodiment, when the number of PI errors in RMD exceeds the allowable value, OPC is executed again using an algorithm different from the original processing algorithm, and the algorithm of the second OPC can also be changed according to the number of PI errors in RMD. For example, using two allowable values TH1 and TH2 (TH1>TH2), when the number of PI errors in RMD obviously exceeds the allowable value TH1, use a different algorithm from the first OPC, and then execute OPC, and when the number of PI errors in RMD When it is less than TH1 but greater than TH2, use the same algorithm as the original OPC, and then execute OPC. When TH1 is exceeded, the recording power is increased by the specified amount in the same way. When TH2 is exceeded, the recording power is changed at a rate of 0.2mW around the recording power P ₀ . The size of the number changes the algorithm of OPC processing appropriately.

In addition, in this embodiment, when recording the RMD in the RMA area, since rewriting is performed, the recording power can be set in consideration of rewriting characteristics. That is, when an RMD is recorded in the RMA area, the recorded RMD is overwritten, a new RMD is written, the RMD is verified, and the number of PI errors is calculated. The number of PI errors in this case is the number of overwriting errors, and by setting the recording power P ₀ again so that it is below the allowable value, an optimal recording power can be obtained in consideration of the overwriting characteristics of the data area.

As described above, according to the data-recordable optical disc device of the present invention, it is possible to set the optimum recording power without wasting the test area and the data area.

Claims (12)

1. A data-recordable optical disc device, comprising: The setting mechanism records the data in the test area of the optical disc, and sets the recording power according to the quality of the reproduced signal obtained by reproducing the test data; a recording mechanism, using the recording power, to record management data on the recording management area of the optical disc; a verification body, which verifies the recorded management data; an error detection mechanism for detecting the number of errors in the management data when the verification result is affirmative; a comparing mechanism, which compares the number of errors with an allowable value; A correction means corrects the recording power when the number of errors exceeds the allowable value. 2. The optical disc device according to claim 1, wherein the correction means changes the setting method determined by the setting means, and executes it repeatedly for correction. 3. The optical disc device according to claim 1, wherein the correction means performs correction by increasing or decreasing the recording power by a predetermined amount or a predetermined ratio. 4. The optical disc device according to claim 2, wherein the setting mechanism sets the recording power according to the quality of the reproduced signal, and the quality of the reproduced signal is a plurality of laser powers varying in a specified range. , obtained when recording the test data; The correction means performs correction by repeatedly performing the operation of reducing the predetermined width in the setting means. 5. The optical disc device according to claim 2, wherein the setting mechanism sets the laser power at which the reproduced signal quality is closest to a target value among the quality of the reproduced signal when recording the test data with a plurality of laser powers. is the recording power; The correction means performs correction by repeatedly performing an operation of changing the target value in the setting means. 6. The optical disc device according to claim 2, wherein the setting mechanism sets the laser power at which the reproduced signal quality is closest to a target value among the quality of the reproduced signal when recording the test data with a plurality of laser powers. is the recording power; The correction mechanism is repeatedly executed by the setting mechanism within a specified power range limited to the vicinity of the laser power to perform correction. 7. The optical disc device according to claim 2, wherein the setting mechanism sets the recording power according to the quality of the reproduced signal when recording the test data according to a specified recording strategy; The correction means repeatedly executes the operation of changing the recording policy in the setting means to perform correction. 8. The optical disc device according to claim 1, wherein the error detection means is configured to detect the number of PI errors of the management data. 9. The optical disc device as claimed in claim 8, comprising: A detection mechanism reproduces the concave-convex data existing in the specified area of the optical disc, and detects the number of PI errors; The allowable value setting means sets the allowable value based on the number of PI errors of the uneven data. 10. The optical disc device according to claim 1, wherein the optical disc is DVD-R or DVD-RW, the recording management area is RMA, and the management data is RMD. 11. The optical disc device according to claim 10, wherein the error detection mechanism is used to detect the number of PI errors in 1ECC blocks of the RMD. 12. An optical disc device, comprising: The counting mechanism calculates the number of errors by reproducing the concave-convex data of the optical disc; Setting the allowable value mechanism, setting the allowable value according to the error number of the concave-convex data; Setting the recording power mechanism to change the laser power to record the test data on the optical disc, and setting the recording power according to the reproduced signal quality of the test data; a management data recording mechanism for recording the management data on the optical disc at the recording power; an error counting mechanism for counting the number of errors by reproducing the management data; The data recording mechanism, when the error number of the management data exceeds the allowable value, changes the laser power around the recording power, records the test data again, and sets the recording power again according to the reproduced signal quality of the test data, when When the number of errors of the management data is equal to or less than the allowable value, data is recorded on the optical disc at the recording power.

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